<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<!-- 数据代理：通过一个对象代理对另一个对象中属性的操作（读/写）-->
    <script>
        let obj = {
            aa: 100,

        }
        let obj1 = {
            x: 100
        }

        let obj2 = {
            y: 200
        }

        Object.defineProperty(obj2,'x',{
            get() {
                return obj1.x
            },
            set(v) {
                obj1.x = v
            }
        })
    </script>
</body>
</html>